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p  Instantaneous power 
P  Phosphorus  
P  Pico (10^-12) 
P  Positive peak 
P  Power 
PA  Power Amplifier
PA  Public Address
PAC  Perturbed Angular Correlation; Photoactive compound; Primary Access Framer/Controller   
PAC  Programmable Automation Controllers
PACVD  Plasma-assisted chemical vapor deposition  
PAD  Program Associated data
PAE  Power Added Efficiency  
PAL  Phase Alternative Line
PAL  Process Automation Language; Programmable Array Logic
PAL  Process Asset Library; Phase Alternation Line  
PAM  Pulse amplitude modulation 
PAM   Process Application Module 
PAS  Photoacoustic spectroscopy  
PAT  Process Action Team; Program Allocation Table  
PAWS  Portable acoustic wave sensor  
PA-FTIR  Photoacoustic Fourier transform infrared spectroscopy  
PB  Printed board  
PBC  Peripheral Board Controller   
PBET  Performance-based equipment training  
PBGA  Plastic ball grid array  
PBL  Poly-buffered LOCOS  
PBM  Portable bitmap image format  
PBS  Photon backscattering  
PBX  Private Branch Exchange (for telephone)
PC  Personal computer
PC  Personal Computer; Programmable Controller; Process Control  
PCA  Printed Circuit Assembly; Policy Certification Authority  
PCAD  Packaging Computer-Aided Design  
PCB  Printed Circuit Board
PCD  PolyCrystaline Diamond; Kodak PhotoCD image format  
PCG  Phono Cardio Graph
PCI  Peripheral Component Interconnect  
PCM  Powertrain Control Module
PCM  Process Control Monitor  
PCM  Pulse Code Modulation
PCMCIA  PC Memory Card International Association  
PCMP  Post Chemical-Mechanical Polishing  
PCMS  Plasma Chemistry Monte-Carlo Simulation  
PCN  Personal Communication Network
PCO  PhotoCatalytic Oxidation  
PCR  Principle Component Regression  
PCS  Personal Communication
PCS  Production Cost Savings; Personal Communication Services  
PCT  Process Change Teams; Macintosh PICT image format  
PCV  PRISM Controlled Vocabulary  
PCVD  Plasma Chemical Vapor Deposition (Philips / Dakra)  
PCX  Zsoft Paintbrush image format  
PDA  Personal Digital Assistant
PDC  Passive Data Collection  
PDES  Product Data Exchange Specification  
PDF  Portable Document Format  
PDIP  Plastic Dual In-line Packaging  
PDL  Page Description Language; Pipeline Definition Language (XML)  
PDM  Pulse-duration modulation
PDP  Plasma Display Panel
PDR  Polarization Differential Reflectance; Personal Digital Recorder  
PDS  Photo-thermal Deflection Spectroscopy  
PDSA  PeroxyDiSulfuric Acid  
PDU  Protocol Data Unit  
PDVC  Phase-Dependent Voltage Contrast  
PE  PiezoElectric  
PEB  Post Exposure Bake  
PEC  Perfect Electrical Conductor  
PECVD  Plasma Enhanced CVD  
PEDS  Plasma-Enhanced Deposition System  
PEEL  Programmable Electrically Eraseable Logic  
PEELS  Parallel Electron Energy Loss Spectroscopy  
PEM  Photo Elastic Modulator  
PERM  Pre-Embossed Rigid Magnetic  
PERT  Program evaluation review technique  
PES  Photoelectron spectroscopy  
PET  Post-etch treatment  
PETEOS  Plasma-enhanced tetraethylosilicate  
PFC  Perfluorocompound; Perfluorocarbon  
PFN  Pulse forming network  
PFR  Plug-flow reactor  
PFTQ  Partnering for Total Quality  
PGA  Pin grid array  
PGI  Purge gas inlet  
PGM  Portable greymap image format  
PGT  Princeton Gamma Tech  
PHEEM  Photoelectron-emission Microscopy  
PHEMT  Pseudomorphic HEMT  
PHIGS  Programmer's Hierarchical Interface Graphics Standard  
PHP  Personal Handy Phone  
PHS  Personal Handy Phone System  
PHY  Physical Layer  
PI  Proportional integral  
PIA  Parallel Interface Adapter  
PIC  PC Paint image format; Peripheral Interrupt Controller; Peripheral Interface Controller; Peripheral Interface Circuit  
PICTS  Photo-Induced Current Transient Spectroscopy  
PID  Proportional Integral Derivative; Process-Induced Defect; Photo-Imageable Dielectric; Packet ID  
PIH  Pin In Hole  
PIII  Plasma Immersion Ion Implantation  
PIN  P-type/Insulator/N-type; Personal Identification Number  
PIND  Particle Impact Noise Detection  
PIO  Parallel Input Output   
PIP  Process-Induced Particles; Picture-In-Picture  
PIPO  Parallel In Parallel Out   
PISO  Parallel In Serial Out   
PIV  Peak Inverse Voltage; Post Indicator Valve  
PIXE  Particle Induced X-ray Emission  
PKCS  Public Key Cryptography Standards  
PKI  Public Key Infrastructure  
PL  Photo Luminescence  
PLA  Programmable Logic Array  
PLC  Programmable Logic Control
PLC  Programmable Logic Controller  
PLCC  Plastic Leaded Chip Carrier  
PLD  Programmable Logic Device 
PLD  Pulsed Laser Deposition  
PLE  Photo Luminescence Excitation  
PLL  Phase locked loop 
PLL  Plasma Lock Load  
PLS  Partial least squares; Projection of latent structures  
PLTV  Percentage Local Thickness Variation  
PLY  Photolimited yield  
PM  Phase modulation; Permanent magnet 
PM  Preventive maintenance; Process module; Post meridiem (after noon)  
PMC  Process Module Controller; Perfect Magnetic Conductor  
PMCC  Pensky-Martens closed cup  
PME  Paramagnetic Meissner Effect  
PMEM  Piezoelectric MEM  
PMI  Phase measuring interferometer  
PML  Partner Markup Language  
PMOS  Positive channel metal-oxide semiconductor  
PMS  Particle Measuring System  
PMT  PhotoMultiplier Tube; Program Map Table  
PMTF  Product Management Task Force  
PN  Pseudo Noise
PNA  Personal Network Analyzer  
PNG  Portable Network Graphics image format  
PNP  Positive-negative-positive 
PNVS  Pilot's Night Vision System  
POR  Process-of-record  
POSIX  Portable Operating System Interface for computing environments  
POU  Point-Of-Use  
POUCG  Point-Of-Use Chemical Generation  
PP  Preference Profile  
PPC  Photo Persistent Conductivity  
PPE  Personal Protective Equipment  
PPGA  Plastic Pin Grid Array  
PPI  Planned Position Indicator  
PPID  Process Program IDentification  
PPM  Portable PixelMap image format  
PPM  Pulse-position modulation 
PPMS  Physical Properties Measurement System  
PPO  Polyphenylene Oxide  
PPPL  Princeton Plasma Phisics Laboratory  
PPRAM  Parallel Processing Random Access Memory  
PPREF  Process Program REFerence  
PPS  PolyPhenylene Sulfide (Plastic)  
PPTC  Polymeric Positive Temperature Co-efficient
PQFP  Plastic Quad Flat Pack  
PR  Photo-Resist  
PRAS  Particle Reactor Analysis Services  
PRAT  Production Reliability Acceptance Test  
PRB  Pseudo-Random Binary
PRBS  Pseudo-Random Binary Sequences  
PRDDO  Partial Retention of Diatomic Differential Overlap  
PRESS  PRediction Error Sum of Squares  
PRF  Pulse Repetition Frequency
PRI  Primary Rate Interface
PRISM  Publishing Requirements for Industry Standard Metadata
PRISM  Primary Rate Interface Signaling and Maintenance controller   
PRL  Physical Review Letters; Property Rights Language  
PRML  Partial Response/Maximum Likelihood  
PROM  Programmable Read Only Memory
PRSC  Parametric Response Surface Control  
PRT  Planar Resistor Technology  
PRT  Pulse repetition time 
PS  Porous Silicon  
PSB  Phase Shifting Blank  
PSC  Porous Silicon Capacitor  
PSC  Programmable System Chip
PSD  Power Spectral Density; Port Status Display; Position (Phase) Sensitive Detector; Photoshop image format; Programmable System Device  
PSG  Phospho Silicate Glass  
PSI  Pounds Per Square Inch; Program Specific Information  
PSII  Plasma Source Ion Implantation  
PSIP  Program and System Information Protocol  
PSK  Pulse Shift Keying
PSL  PolyStyrene Latex  
PSLS  PolyStyrene Latex Sphere  
PSLV  Polar Satellite Launch Vehicle
PSM  Phase Shifting Mask  
PSP  PaintShop Pro image format  
PSR  Perfectly stirred reactor  
PSTN  Public Switched Telecom Network  
PT  Positional tolerance  
PTAB  Project Technical Advisory Board  
PTC  Positive Temperature Co-efficient
PTC  Pre- and post-process Treatment Chambers; Positive Temperature Coefficient  
PTH  Plated Through Hole  
PTIS  Photo Thermal Ionization Spectroscopy  
PV  Photo Voltaic
PVA  Polyvinylacetate  
PVC  Pressure Velocity Correction; PolyVinylChloride  
PVD  Physical Vapor Deposition  
PVR  Personal Video Recorder
PW  Pulse width 
PWA  Printed Wiring Assembly  
PWB  Printed Wiring Board  
PWM  Pulse Width Modulation
PWP  Particles per Wafer Pass  
PYS  Photo Yield Spectroscopy  
P1dB  Power at 1 dB compression  
pA  Picoampere 
PA  Public Address
Pav  Average power 
Pb  Lead  
peta 10^15
pF  Picofarad 
P-GILD  Projection gas immersion laser doping  
POT  Potentiometer 
P-P  Peak to peak 
Ppm  parts per million  
ProgGuiML  ProgramGuide Mark-up Language  
Pt  Platinum